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add a note about representations 

Ref: https://github.com/kdl-org/kdl/issues/121
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Kat Marchán 2021-09-01 12:53:18 -07:00
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@ -242,6 +242,13 @@ distinction in KDL between real numbers, integers, and floating point numbers.
It's up to individual implementations to determine how to represent KDL
numbers.
Implementations MUST support number values representable as IEEE754 floating
point numbers. That is, all implementations must support at least the numbers
between `-(2^53 - 1)` and `2^53 - 1`. Larger or smaller values MAY error, or
be represented as `Infinity`, or `NaN`, or any other value of the
implementation's choosing. If you want to reliably represent numbers outside
of this range, use the `string` type to represent them.
There are four syntaxes for Numbers: Decimal, Hexadecimal, Octal, and Binary.
* All numbers may optionally start with one of `-` or `+`, which determine whether they'll be positive or negative.